Even these features [jury trials, contingency fees, lack of loser-pays, extensive lawyer-driven discovery] aren't the whole story. American judges frequently let juries decide whether honest mistakes are negligent. Judges in other nations are less likely to do so. American courts commonly think it proper for juries to infer medical negligence from the mere occurrence of a serious injury. European judges usually will not.

American plaintiffs are sometimes spared the heavy burden of identifying particular acts of negligence, or of showing the precise causal connection between a negligent act and an actual injury. Lastly, damage awards for lost income and medical expenses in the U.S. tend to dwarf awards made elsewhere -- in part because governments elsewhere provide this medical care from their nationalized systems. In sum, the medical malpractice system provides incentives for plaintiffs that really do matter. Americans, for example, file claims about 3.5 times more often than Canadians.

It's not clear what we're getting from our exorbitantly expensive way of doing things:

More disturbingly, a careful 1992 study by Donald Dewees and Michael Trebilcock in the Osgoode Hall Law Journal concluded that the frequency of medical malpractice in Canada was about the same as in the U.S. -- for about 10% the total cost. In other words, our costly system doesn't seem to do much to deter malpractice. On medical malpractice at least, Canada does better than we do.